TWEWY took me exactly 3 days...
The game that took the second longest is MP:H 20 hours on story, another 40 hours on WiFi and around about 2 hours on local wireless. Thats on my (U) copy.
Longest, Boktai 2 took me 6 months to complete because of its hard puzzles. And I took 99+ hours alone from the puzzles in the stupid church, on the brighter side, I became lavel 99 with all weapons and level 70/ish killing Boks and Crimson Boks.